Red/Grey was a dumb idea for a thread. This is awesome. (As a person who has whittled down her facebook feed to mostly cute animals and skiing.)
When I first met my now-husband, I had a cat, and he was concerned about being allergic to her. I told husband that the cat was non-negotiable. He was hurt, but I explained that he could find another girlfriend; the cat, who frankly was a pill, was family - and besides, there was no guarantee she'd find another good home (see: was a pill, not that good pets always get homes, either). I take the idea of a forever home seriously.
Later, we adopted another cat, mistakenly thinking my first cat wanted a buddy. The second cat was fantastic, but there was a battle royale every day in our house, and at the same time, my husband had a medical issue requiring brief hospitalization. The original owner, who had said she'd take the second cat back if they didn't get along, wouldn't take him back. She thought maybe this highly personable cat, who actually hugged us and wanted to spend every minute with us, should be a barn cat. The doctor said my husband's allergies might play a role in the health issue, which I was pretty sure was BS and in the long term definitely turned out to be BS, but with all of this going on ... I put the second cat in a fantastic boarding facility for a few weeks while trying to find a new owner, but it was close to a holiday, and they couldn't keep him because they were already booked up. Ultimately I brought the second cat to the no-kill shelter and left him there with a care package for the next owner - some money, a note. I visited him almost every day while he was there - he had a pretty large kennel with a cat tree and a roommate. He was adopted the day after Christmas. I was heartbroken. It was probably his fourth home, even though he was the best cat ever.
And that's how I learned that sometimes, the people who abandon their pets are not terrible people.